The provisions of Article 201 (Amount of Tax Withheld from Retirement Income) of the new Act as replaced pursuant to Article 3, paragraph (1) of the Supplementary Provisions and Appended Table VI of the Supplementary Provisions apply to severance pay or other such compensation prescribed in Article 199 (Obligation to Withhold Taxes from Retirement Income) of the new Act (hereinafter referred to as "severance pay or other such compensation") that is to be paid in 1969 and is paid on or after the effective date, and the provisions then in force continue to govern severance pay or other such compensation to be paid in that year that was paid before that date.